/* ========== 13. 登录页 ========== */

/* ------ 13.1 登录容器 ------ */
.login-body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    margin: 0;
}
.login-container {
    background: #fff;
    border-radius: 16px;
    padding: 32px 28px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    margin: 20px auto;
}
.login-title {
    text-align: center;
    font-size: 24px;
    font-weight: 700;
    color: #333;
    margin-bottom: 4px;
}
.login-subtitle {
    text-align: center;
    font-size: 13px;
    color: #999;
    margin-bottom: 28px;
}

/* ------ 13.2 登录表单 ------ */
.form-group {
    margin-bottom: 18px;
}
.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: #555;
    margin-bottom: 6px;
}
.form-group input {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid #e8ecf1;
    border-radius: 10px;
    font-size: 15px;
    transition: border-color 0.3s;
    outline: none;
    background: #fff;
}
.form-group input:focus {
    border-color: #667eea;
}

/* ------ 13.3 登录按钮 ------ */
.login-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s;
}
.login-btn:active {
    transform: scale(0.98);
}
.login-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.login-error-msg {
    color: #e74c3c;
    font-size: 14px;
    text-align: center;
    margin-top: 10px;
    display: none;
}
.login-error-msg.show {
    display: block;
}

.login-demo-tips {
    margin-top: 16px;
    padding: 12px 16px;
    background: #f8f9fa;
    border-radius: 10px;
    font-size: 12px;
    color: #666;
    text-align: center;
}
.login-demo-tips strong {
    color: #333;
}


/* ========== 14. 滑动验证 ========== */
.slider-container {
    margin-bottom: 18px;
    user-select: none;
}
.slider-track {
    position: relative;
    width: 100%;
    height: 44px;
    background: #f0f2f5;
    border-radius: 8px;
    overflow: hidden;
    border: 2px solid #e8ecf1;
    transition: border-color 0.3s;
}
.slider-track.success {
    border-color: #43a047;
}
.slider-track.error {
    border-color: #e74c3c;
    animation: shake 0.4s ease;
}
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}
.slider-bg {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #a8d8ea, #667eea);
    border-radius: 6px;
    transition: width 0.1s;
    pointer-events: none;
}
.slider-bg.success {
    background: linear-gradient(90deg, #66bb6a, #43a047);
}
.slider-text {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: #999;
    pointer-events: none;
    z-index: 1;
}
.slider-text.success {
    color: #fff;
}
.slider-text .icon {
    margin-right: 8px;
}
.slider-btn {
    position: absolute;
    left: 2px;
    top: 2px;
    width: 40px;
    height: 40px;
    background: #fff;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    cursor: grab;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: #667eea;
    transition: box-shadow 0.2s;
    touch-action: none;
}
.slider-btn:active {
    cursor: grabbing;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}
.slider-btn.success {
    background: #43a047;
    color: #fff;
    cursor: default;
}
.slider-btn.error {
    background: #e74c3c;
    color: #fff;
}
.slider-verify-status {
    font-size: 12px;
    color: #999;
    margin-top: 6px;
    text-align: center;
    min-height: 20px;
}
.slider-verify-status.success {
    color: #43a047;
}
.slider-verify-status.error {
    color: #e74c3c;
}


/* ========== 15. 响应式 ========== */
@media (max-width: 480px) {
    .login-container {
        padding: 24px 20px;
        margin: 10px auto;
    }
    .login-title {
        font-size: 20px;
    }
    .slider-track {
        height: 40px;
    }
    .slider-btn {
        width: 36px;
        height: 36px;
        font-size: 18px;
    }
}